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rclone/onedrive/replace.go
Nick Craig-Wood 2fcb8f5db7 Add support for Microsoft One Drive - fixes #10
* Still to do
    * Copy
    * Move
    * MoveDir
2015-11-07 10:19:10 +00:00

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/*
Translate file names for one drive
OneDrive reserved characters
The following characters are OneDrive reserved characters, and can't
be used in OneDrive folder and file names.
onedrive-reserved = "/" / "\" / "*" / "<" / ">" / "?" / ":" / "|"
onedrive-business-reserved
= "/" / "\" / "*" / "<" / ">" / "?" / ":" / "|" / "#" / "%"
Note: Folder names can't end with a period (.).
Note: OneDrive for Business file or folder names cannot begin with a
tilde ('~').
*/
package onedrive
import (
"regexp"
"strings"
)
// charMap holds replacements for characters
//
// Onedrive has a restricted set of characters compared to other cloud
// storage systems, so we to map these to the FULLWIDTH unicode
// equivalents
//
// http://unicode-search.net/unicode-namesearch.pl?term=SOLIDUS
var (
charMap = map[rune]rune{
'\\': '', // FULLWIDTH REVERSE SOLIDUS
'*': '', // FULLWIDTH ASTERISK
'<': '', // FULLWIDTH LESS-THAN SIGN
'>': '', // FULLWIDTH GREATER-THAN SIGN
'?': '', // FULLWIDTH QUESTION MARK
':': '', // FULLWIDTH COLON
'|': '', // FULLWIDTH VERTICAL LINE
'#': '', // FULLWIDTH NUMBER SIGN
'%': '', // FULLWIDTH PERCENT SIGN
'"': '', // FULLWIDTH QUOTATION MARK - not on the list but seems to be reserved
'.': '', // FULLWIDTH FULL STOP
'~': '', // FULLWIDTH TILDE
' ': '␠', // SYMBOL FOR SPACE
}
invCharMap map[rune]rune
fixEndingInPeriod = regexp.MustCompile(`\.(/|$)`)
fixStartingWithTilde = regexp.MustCompile(`(/|^)~`)
fixStartingWithSpace = regexp.MustCompile(`(/|^) `)
)
func init() {
// Create inverse charMap
invCharMap = make(map[rune]rune, len(charMap))
for k, v := range charMap {
invCharMap[v] = k
}
}
// replaceReservedChars takes a path and substitutes any reserved
// characters in it
func replaceReservedChars(in string) string {
// Folder names can't end with a period '.'
in = fixEndingInPeriod.ReplaceAllString(in, string(charMap['.'])+"$1")
// OneDrive for Business file or folder names cannot begin with a tilde '~'
in = fixStartingWithTilde.ReplaceAllString(in, "$1"+string(charMap['~']))
// Apparently file names can't start with space either
in = fixStartingWithSpace.ReplaceAllString(in, "$1"+string(charMap[' ']))
// Replace reserved characters
return strings.Map(func(c rune) rune {
if replacement, ok := charMap[c]; ok && c != '.' && c != '~' && c != ' ' {
return replacement
}
return c
}, in)
}
// restoreReservedChars takes a path and undoes any substitutions
// made by replaceReservedChars
func restoreReservedChars(in string) string {
return strings.Map(func(c rune) rune {
if replacement, ok := invCharMap[c]; ok {
return replacement
}
return c
}, in)
}